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True, they don't make anything like they used to and people get sick from destroyed items as well.

I heard cheaper power supplies' capacitors parts sometimes explode, and release smoke which can harm people's health.

Anything that overpowers and burns is bad for someone's health, usually best to run a diffuser in the home with scented oil to get rid of the smell.

I think air purifiers are good for removing smoke and germs from the air.

They are, though the filters can be a little expensive.

I wonder if it is possible to make your own filter from paper or cloth to save money.

It might be, but I'm not skilled enough to make that kind of thing. Easier to buy things pre-made, specially if not feeling well.